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Experimental determination of drag coefficients in low-density polyurethane foam (open access)

Experimental determination of drag coefficients in low-density polyurethane foam

We describe several experiments performed at the LLNL Site 300 firing range and on the LLNL 1/3 scale gun to investigate the deceleration of small projectiles (l {approx} 3-5 [mm]) in low-density foam ({rho} {approx} 0.08-0.32 [g/cm{sup 3}]). The experiments at the firing range researched a passive velocity diagnostic based on Faraday's law of induction, while experiments on the 1/3 scale gun investigated the effects of varying projectile surface area, projectile shape, and foam density on the drag coefficient c{sub d}. Analysis shows that the velocity diagnostic has an uncertainty on the order of 1 percent for projectiles with velocity v {approx} 0.8-1.2 [km/s]. The 1/3 scale gun experiments, dubbed the Krispy Kreme series, included nine shots considering the combinations of 3 projectile surface areas with 3 target densities. The experiments used Tantalum square surface area block projectiles (with an initial velocity v{sub 0} {approx} 1.2 [km/s], a common thickness T = 2.67 [mm], and square side lengths of 3, 4, and 5 [mm]) decelerating in polyurethane foams (with densities {rho}{sub f} of 0.08, 0.16 and 0.32 [g/cm{sup 3}]). Standard fluid models of the Krispy Kreme experiments predict Reynolds numbers Re {approx} 10{sup 5} - 10{sup 6}, Mach numbers Ma …
Date: April 18, 2006
Creator: Adams, M L
Object Type: Report
System: The UNT Digital Library

[Maple Hall residents perform Hall of the Year presentation, 1]

Photograph of Maple Hall residents performing a skit during their Hall of the Year presentation. Ten individuals can be seen facing a projector screen showing desert scenery. Eight individuals are kneeling, and two are standing. Several members of the group are raising their arms.
Date: April 18, 2006
Creator: Baugh, Brian
Object Type: Photograph
System: The UNT Digital Library

[Maple Hall residents perform Hall of the Year presentation, 2]

Photograph of Maple Hall residents performing a skit during their Hall of the Year presentation. Eleven individuals can be seen facing to the left of the camera, raising their arms in different positions. Two individuals in the front of the group are clapping. Desert scenery is being projected onto the wall behind them.
Date: April 18, 2006
Creator: Baugh, Brian
Object Type: Photograph
System: The UNT Digital Library

[Student performs Hall of Year skit]

Photograph of a student performing a skit during the Hall of the Year event hosted by UNT's Residence Hall Association. The young man is standing in front of a blank wall, facing to the left of the camera and holding a tissue over his nose. A football is visible on the floor next to his feet.
Date: April 18, 2006
Creator: Baugh, Brian
Object Type: Photograph
System: The UNT Digital Library

[Student performs Napoleon Dynamite dance at Hall of the Year contest]

Photograph of a member of the Santa Fe Square and Traditions Hall team performing a dance sequence from "Napoleon Dynamite" during UNT's Hall of the Year event. The young man can be seen standing in the center of the photograph with his hands in the front pockets of his pants, looking down. Text on the front of his t-shirt reads, "VOTE FOR SFT."
Date: April 18, 2006
Creator: Baugh, Brian
Object Type: Photograph
System: The UNT Digital Library
Perry Daily Journal (Perry, Okla.), Vol. 114, No. 76, Ed. 1 Tuesday, April 18, 2006 (open access)

Perry Daily Journal (Perry, Okla.), Vol. 114, No. 76, Ed. 1 Tuesday, April 18, 2006

Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date: April 18, 2006
Creator: Brown, Gloria
Object Type: Newspaper
System: The Gateway to Oklahoma History
The Express-Star (Chickasha, Okla.), Ed. 1 Tuesday, April 18, 2006 (open access)

The Express-Star (Chickasha, Okla.), Ed. 1 Tuesday, April 18, 2006

Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date: April 18, 2006
Creator: Bush, Kent
Object Type: Newspaper
System: The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 107, No. 321, Ed. 1 Tuesday, April 18, 2006 (open access)

Altus Times (Altus, Okla.), Vol. 107, No. 321, Ed. 1 Tuesday, April 18, 2006

Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date: April 18, 2006
Creator: Bush, Michael
Object Type: Newspaper
System: The Gateway to Oklahoma History
Boerne Star & Recorder (Boerne, Tex.), Vol. 100, No. 31, Ed. 1 Tuesday, April 18, 2006 (open access)

Boerne Star & Recorder (Boerne, Tex.), Vol. 100, No. 31, Ed. 1 Tuesday, April 18, 2006

Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date: April 18, 2006
Creator: Cartwright, Brian
Object Type: Newspaper
System: The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 85, No. 129, Ed. 1 Tuesday, April 18, 2006 (open access)

The Baytown Sun (Baytown, Tex.), Vol. 85, No. 129, Ed. 1 Tuesday, April 18, 2006

Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date: April 18, 2006
Creator: Cash, Wanda Garner
Object Type: Newspaper
System: The Portal to Texas History

[Boy hitting speed bag with blue boxing gloves]

At ten years of age, he has won several fights in his division. Like him, more than seventy students take advantage of the gym in the south of Fort Worth in exchange for keeping a good academic standing.
Date: April 18, 2006
Creator: Castillo, José L.
Object Type: Photograph
System: The UNT Digital Library

[Carlos Francisco de Anda conducts an Early Education Program class]

Carlos Francisco de Anda conducts an Early Education Program class. The program is designed to help parents prepare their children for school.
Date: April 18, 2006
Creator: Castillo, José L.
Object Type: Photograph
System: The UNT Digital Library

[Carlos Francisco de Anda instructs families during an Early Education Program class]

A man speaks to families participating in an Early Education Program class. The goal of the program is to help parents prepare their children for school.
Date: April 18, 2006
Creator: Castillo, José L.
Object Type: Photograph
System: The UNT Digital Library

[Carlos Francisco de Anda interacts with parents during an Early Education Program class]

Carlos Francisco de Anda conducts an Early Education Program class. The program is designed to help parents prepare their children for school.
Date: April 18, 2006
Creator: Castillo, José L.
Object Type: Photograph
System: The UNT Digital Library

[Carlos Francisco de Anda passes out information sheets]

Carlos Francisco de Anda passes out information sheets during an Early Education Program class. The program is designed to help parents prepare their children for school.
Date: April 18, 2006
Creator: Castillo, José L.
Object Type: Photograph
System: The UNT Digital Library

[Carlos Francisco de Anda passes out information sheets during an Early Education Program class]

Carlos Francisco de Anda passes out information to parents participating in an Early Education Program class.
Date: April 18, 2006
Creator: Castillo, José L.
Object Type: Photograph
System: The UNT Digital Library

[Carlos Francisco de Anda speaks to a group of parents]

Carlos Francisco de Anda, a specialist with the Early Education Program of Fort Worth, speaks to a group of parents during one of the education classes. The goal of the program is to create a home-based methodology so that pre-school age children will have better knowledge and tools before they enter school.
Date: April 18, 2006
Creator: Castillo, José L.
Object Type: Photograph
System: The UNT Digital Library

[Carlos Francisco de Anda speaks to an Early Education Program class]

Carlos Francisco de Anda, a specialist with the Early education program of Fort Worth, speaks to family groups during a class. The program's goal is to help parents prepare their children for school.
Date: April 18, 2006
Creator: Castillo, José L.
Object Type: Photograph
System: The UNT Digital Library

[Children play during an Early Education Program class]

Children play while their parents take part in the Early Education Program of Fort Worth, Texas. The program's goal is to give the parents the skills to help the children prepare for school.
Date: April 18, 2006
Creator: Castillo, José L.
Object Type: Photograph
System: The UNT Digital Library

[Children play with Lorena Vasquesz]

Lorena Vasquez entertains children during an Early Education Program in Fort Worth, Texas. The goal of the program is to give parents the skills they need to help prepare their children for school.
Date: April 18, 2006
Creator: Castillo, José L.
Object Type: Photograph
System: The UNT Digital Library

[Families gather for an Early Education Program class]

Families gather for an Early Education Program class in Fort Worth, Texas. The program helps parents prepare their children to attend school.
Date: April 18, 2006
Creator: Castillo, José L.
Object Type: Photograph
System: The UNT Digital Library

[Girl works on a drawing]

This girl participates in a pilot program in Fort Worth which aims to educated parents with pre-school age children to use home-based methods to provide knowledge and skills children will need in school.
Date: April 18, 2006
Creator: Castillo, José L.
Object Type: Photograph
System: The UNT Digital Library

[Instructor monitors a mother's progress learning first aid]

An instructor monitors a mother's performance during a first aid class. The class is part of the Early education Program of Fort Worth, Texas. The program helps parents acquire the skills to prepare their children for school
Date: April 18, 2006
Creator: Castillo, José L.
Object Type: Photograph
System: The UNT Digital Library

[Instructor talks a parent through first aid training]

An instructor talks a parent through a first aid class. The class is part of the Early Education Program of Fort Worth, Texas which seeks to help parents prepare their children for school.
Date: April 18, 2006
Creator: Castillo, José L.
Object Type: Photograph
System: The UNT Digital Library